Look..if you know how to use Google Sketchup...then it's the best for making models. It's easy to learn,good uv-maping (i know someone told it's bad...but probably he haven't tried it yet...there is many ways to make uvmap better and easier....
I think you need to try all programs that you think you will can handle....you will see..we can't tell you what is the best program for modeling till you try them. Because maybe for me Google Sketchup is better than blender...but someone other will say "Blender is better than Google Sketchup"...you know what i mean? So.. you need to find the right program..
And..yes..Google sketchup can export to .X, and yes it can make UVMAPS, and yes it can animate (there is plugin, but use something other for animating because its a bit hard), and yes its really good for me....
Best,
Crysis